r/LocalLLaMA July 30, 2026 · Communities

Is a second local LLM actually a security boundary, or just another probabilistic opinion?

I keep seeing the same security architecture proposed for local agents: user input → main model → guard model → tool execution It looks clean in a diagram. I’m not convinced it creates a reliable security boundary. The guard model is usually expected to classify inputs containing code, shell commands, SQL, Base64, URLs